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12 Feb 2007

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MP3Parser.hpp

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 * ViTooKi                                                              *
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 * title: MP3Parser.hpp                                                 *
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#if !defined(AFX_MP3PARSER_HPP__E08F3107_12A3_4E12_8A7F_63B15BE916FF__INCLUDED_)     
#define AFX_MP3PARSER_HPP__E08F3107_12A3_4E12_8A7F_63B15BE916FF__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif                          // _MSC_VER > 1000


#include "string.h"
#include "AudioAdaptor.hpp"
#ifdef ISOMP4
#include "ISOMovies.h"
#endif

enum MpegAudioVersionID {
        MPEG_VESION_2_5,
        RESERVED,
        MPEG_VERSION_2,
        MPEG_VERSION_1,
};

enum MpegAudioLayerNo {
        RESERVed,
        LAYER_III,
        LAYER_II,
        LAYER_I,
};

enum ChannelMod {
        STEREO,
        JOINT_STEREO,
        DUAL_CHANNEL,
        SINGLE_CHANNEL,
};

enum Emphasis {
        NONE_,
        MS5015,
        RESERVEd,
        CCIT_J_17,
};

typedef struct {
        /* Frame sync is the Mpeg audio Frame Header Startcode*/
        int frame_sync;
        /* MPEG Audio version ID
                00 - MPEG Version 2.5
                01 - reserved
                10 - MPEG Version 2 (ISO/IEC 13818-3)
                11 - MPEG Version 1 (ISO/IEC 11172-3) */
        enum MpegAudioVersionID mpeg_audio_version_ID;
        /* Layer description
                00 - reserved
                01 - Layer III
                10 - Layer II
                11 - Layer I */
        enum MpegAudioLayerNo mpeg_audio_layer_no;
        /*Protection bit
                0 - Protected by CRC (16bit crc follows header)
                1 - Not protected */
        bool protection;
        /*Bitrate index 
                NOTE: bitrate in kbps
                see Bitrate index Table */
        unsigned int bitrate;
        /* Bitrate index Table 
                bitrate is obtainded by mapping into this table */
        unsigned int mpeg_audio_bitrate_index_table[80];
        /* Sampling rate frequency index (values are in Hz)
                see Sampling rate frequency Table*/
        unsigned int sampling_rate;
        /* Duration of a frame in mediaTimeScale units 
         * this is not obtained from header but calculated from other values
         */
        unsigned int frame_duration;
        /* bits per sample of the uncompressed WAV frame */
        unsigned int bits_per_sample;
        /* Sampling rate frequency Table
        */
        unsigned int mpeg_audio_sampling_rate_index_table[12];
        /* Padding bit
                0 - frame is not padded
                1 - frame is padded with one extra slot */
        bool padding;
        /* calculate frame size
        */
        unsigned int frame_size_in_bytes;
        /* Private bit. It may be freely used for specific needs of an application, 
                i.e. if it has to trigger some application specific events.*/
        bool private_bit;
        /* Channel Mode
                00 - Stereo
                01 - Joint stereo (Stereo)
                10 - Dual channel (Stereo)
                11 - Single channel (Mono) */
        enum ChannelMod channel_mod;
        /* Mode extension (Only if Joint stereo) 
        */
        unsigned int mode_extension;
        /* Copyright info 
                0 - Audio is not copyrighted
                1 - Audio is copyrighted*/
        bool copyright;
        /* Original
                0 - Copy of original media
                1 - Original media */
        bool original;
        /* Emphasis
                00 - none
                01 - 50/15 ms
                10 - reserved
                11 - CCIT J.17 */
        enum Emphasis emphasis;
        
} structMPEGaudioHeader;


class MP3Parser {
public:
        MP3Parser(); 
        virtual ~ MP3Parser();
  
        structMPEGaudioHeader parseMPEGaudioHeader(u8 * pFramem, u32 iSize);
        
        
private:
        
        structMPEGaudioHeader mp3Header;
        
        u8 mcByte;

        u8 *mpcData;

        int miSize;

        bool mbEOD;
        int miCurrentNoBytes;
    int miCurrentBit;
        
    int miBookmarkedCurrentBit;

        int miBookmarkedByte;

        int miBookmarkedCurrentNoBytes;
        
    void initializeParser(u8 * pFramem, u32 iSize);

        void initializeMPEGaudioHeaderStruct();

        void nextByte();

        bool bytealigned();

        int getBit();
        
        int getBits(int iNumber);

        int nextBits(int iNumber);

        void nextStartCode();

        void loadQuantizerMatrix(unsigned int puiMatrix[]);
        
        void readMarkerBitFunc(int iLine);

        void bookmark();

        void restore();

};

#endif                          // !defined(AFX_MP4DECODER_HPP__E08F3107_12A3_4E12_8A7F_63B15BE916FF__INCLUDED_)

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